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Water-soluble salt core and preparation method thereof

A technology of water-soluble salt and salt core, which is applied to cores, manufacturing tools, casting and molding equipment, etc., can solve the problems of large fluctuation in the strength of composite salt cores, increase in harmful gas emissions, and reduce the service life of pistons, so as to meet the strength requirements. requirements, improved particle size distribution, easy dissolving effect

Inactive Publication Date: 2017-09-29
湖南江滨机器(集团)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because the composite material is difficult to stir evenly during the raw material mixing process, the strength of the obtained composite salt core fluctuates greatly, and its performance is unstable; moreover, the composite salt core is prone to chemical reactions during the high-temperature casting process of aluminum alloy pistons, sticking to the The surface of the internal cooling oil passage of the piston is difficult to flush, which greatly reduces the cooling effect and reduces the service life of the piston. It will also cause serious carbon deposits on the piston and increase the emission of harmful gases.

Method used

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  • Water-soluble salt core and preparation method thereof
  • Water-soluble salt core and preparation method thereof
  • Water-soluble salt core and preparation method thereof

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preparation example Construction

[0042] The invention provides a kind of preparation method of water-soluble salt core, comprises the following steps:

[0043] a) ball milling, sieving and baking the salt powder in sequence to obtain the salt core material;

[0044] b) Sequentially pressing and sintering the salt core material obtained in step a) to obtain a water-soluble salt core.

[0045] In the invention, firstly, the salt powder is ball milled, screened and baked in order to obtain the salt core material. In the present invention, the salt powder is preferably refined industrial salt and / or refined edible salt; wherein NaCl≥92%. In the present invention, the source of the salt powder is not particularly limited, and the above-mentioned commercially available refined industrial salt and refined edible salt well known to those skilled in the art can be used.

[0046]In the invention, firstly, the salt powder is ball-milled to obtain the ball-milled salt powder. In the present invention, the equipment fo...

Embodiment 1

[0068] (1) Pour 100kg of dry salt powder into an 800×1400 ceramic ball mill. The material of the ball is pebbles, and the loading amount is 500kg / time. Ball mill for 5 minutes at a speed of 33r / min (cylinder) to obtain milled salt pink;

[0069] (2) sieve the salt powder after ball milling to obtain the sieved salt powder; the sieve hole size / mesh number comparison table used for the sieving is shown in Table 1;

[0070] Table 1 Sieve hole size / mesh number comparison table used for sieving

[0071] Screen No.(#)

mesh number

Mesh hole size / um

1

230

62

2

180

80

3

170

90

4

115

150

5

80

180

6

60

250

7

42

355

8

32

500

9

24

700

[0072] The particle size distribution of the salt powder after the sieving is as follows: image 3 As shown, specifically:

[0073] Less than 62 μm accounted for 3.90 wt%, less than 80 μm and greater than or equal to 62 μm acc...

Embodiment 2

[0080] The preparation method provided in Example 1 was used to prepare water-soluble salt core products, the difference being that the ball milling time described in step (1) was 1 min;

[0081] The powdered salt after the ball milling is sieved to obtain the powdered salt after the sieving; the particle size distribution of the powdered salt after the sieving is as follows: Figure 6 As shown, specifically:

[0082] Less than 62 μm accounts for 0.57 wt%, less than 80 μm and greater than or equal to 62 μm accounts for 2.38 wt%, less than 90 μm and greater than or equal to 80 μm accounts for 15.99 wt%, less than 150 μm and greater than or equal to 90 μm accounts for 24.87 wt%, less than 180 μm and greater than or equal to 150 μm accounts for 45.41 wt%, less than 250 μm greater than Equal to 180 μm accounts for 9.74 wt%, less than 355 μm and greater than or equal to 250 μm accounts for 0.19 wt%, less than 500 μm and greater than or equal to 355 μm accounts for 0.40 wt%, and les...

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Abstract

The invention provides a water-soluble salt core and a preparation method thereof. The preparation method of the water-soluble salt core comprises the following steps: a) performing ball milling, screening and baking on salt powder in sequence to obtain a salt core material; b) The salt core material obtained in step a) is sequentially pressed and sintered to obtain a water-soluble salt core. Compared with the prior art, the present invention can improve the particle size distribution of the salt powder by ball milling, sieving and roasting the salt powder, so that the salt core material is dense and uniform, with high degree of purification, good fluidity, good filling performance, and The pressing and sintering process under specific parameters, the product quality is good and stable, and meets the strength requirements; at the same time, the water-soluble salt core provided by the invention does not contain any additives, is easy to dissolve, and has no residue in the internal cooling oil passage; the product surface is smooth, High dimensional accuracy, capable of forming smooth, dimensionally accurate internal cooling oil passages.

Description

technical field [0001] The invention relates to the technical field of salt cores, and more specifically relates to a water-soluble salt core and a preparation method thereof. Background technique [0002] The engine is the power source of automobiles, rolling stock and ships, and the piston is the "heart part" of various engines. The function of the piston is to withstand the gas pressure, and transmit the pressure to the connecting rod through the piston pin to drive the crankshaft to rotate. Its structure diagram Such as figure 1 shown. The piston is subjected to high temperature, high pressure, complex friction and heat-mechanical coupling load during the working process, and the working environment is very harsh. Light aluminum alloy material, but when the temperature rises to a certain level, the mechanical properties of the aluminum alloy material will drop sharply, which will easily cause the failure of the aluminum alloy piston, which cannot meet the working requi...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/00
CPCB22C9/105B22C1/00
Inventor 易绿林廖从来朱亿鹏朱茂春贺礼财夏治涛王熹
Owner 湖南江滨机器(集团)有限责任公司
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